package demo2;
//测试类
public class TestUSB {
    public static void main(String[] args) {
        Computer computer = new Computer();
        computer.powerOn();

        //使用鼠标设备
        computer.useDevice(new Mouse());

        //使用键盘设备
        computer.useDevice(new KeyBoard());

        computer.powerOff();
    }
}
